nodeview: enforce minimum scale

2020-06-16 15:37:11 +10:00
parent 5980737742
commit 71fa821e52
2 changed files with 10 additions and 2 deletions
@@ -36,7 +36,8 @@ NodeView::NodeView(QWidget *parent) :
  HandMovableView(parent),
  graph_(nullptr),
  drop_edge_(nullptr),
-  filter_mode_(kFilterShowSelectedBlocks)
+  filter_mode_(kFilterShowSelectedBlocks),
+  scale_(1.0)
 {
  setScene(&scene_);
  SetDefaultDragMode(RubberBandDrag);
@@ -457,7 +458,12 @@ void NodeView::wheelEvent(QWheelEvent *event)
    // FIXME: Hardcoded divider (0.001)
    qreal multiplier = 1.0 + (static_cast<qreal>(event->angleDelta().x() + event->angleDelta().y()) * 0.001);

-    scale(multiplier, multiplier);
+    double test_scale = scale_ * multiplier;
+
+    if (test_scale > 0.1) {
+      scale(multiplier, multiplier);
+      scale_ = test_scale;
+    }
  } else {
    QWidget::wheelEvent(event);
  }